Clinton spokesman Brian Fallon says House Republicans are trying to hurt Clinton politically. He says GOP leaders are now second-guessing Comey's judgment "because his findings do not align with their conspiracy theories."

Fallon says career officials who handled the case determined no further action was appropriate. He is accusing Republicans of trying to politicize the situation.

Comey will testify Thursday before the House Oversight and Government Reform Committee. The hearing will come two days after Comey said that while Clinton and State Department officials were "extremely careless" in their handling of classified material, no charges were appropriate. Attorney General Loretta Lynch accepted that recommendation Wednesday.